This document includes recommended practices for grounding of dc equipment enclosures installed in dc traction power distribution facilities. DC distribution facilities may include@ but are not limited to@ traction power substations@ tie breaker stations@ gap breaker stations@ section huts@ cross-tie substations@ circuit breaker houses@ and equalizer houses. Purpose This document provides recommended practices for grounding dc equipment enclosures to system designers@ transit authorities@ system operators@ and manufacturers of dc traction power distribution facilities